Checker comment "wrong answer Test 226: Expected -1, got a Tree !! (test case 226)" I have checked the -1 condition in the beginning
if(m<n || m>n*(n+1ll)/2ll)
{
cout<<"-1\n";
return;
}
Checker comment "wrong answer Test 226: Expected -1, got a Tree !! (test case 226)" I have checked the -1 condition in the beginning
if(m<n || m>n*(n+1ll)/2ll)
{
cout<<"-1\n";
return;
}
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Hey man your code trips up on the one node cas when n=1 you still fall into the make edges logic and end up printing a false edge like 1 1 so the judge thinkse you handed it a tree instead of just a single node
to fix this slam in an early check if n == 1 then if m == 1 print 1 and return else print -1 and return and only run your normal tree building code when n > 1.
Thank you. Missed a tricky edge case.
happens to the best of us man